The Solar System at your Fingertips
🌎 Location: Greenwich, United Kingdom [change]
Dwarf Planets and Asteroids » 

Asteroid 7 Iris

Available Resources

Asteroid 7 Iris Sky Charts and Coordinates

This is a simplified sky chart, showing where Asteroid 7 Iris is now with respect to the brightest stars and constellations.

More advanced sky charts are available on TheSkyLive for this object: 1) the Online Planetarium which is interactive and allows to select dates and additional objects to visualize; and 2) the Live Position and Data Tracker which provides the highest precision position data and features deep sky imagery from the Digitized Sky Survey.

Asteroid 7 Iris in Sextans on September, 25 2018
High Precision Live Sky Chart
 = visible to the naked eye
 = binocular, brighter than 10th magnitude
= current altitude ≥ 30°   = current altitude < 30°   = below the horizon
Location: Greenwich, United Kingdom [change]
10h 48m 39s
+03° 22’ 39”

Asteroid 7 Iris Rise and Set Times

Today's Asteroid 7 Iris rise, transit and set times from Greenwich, United Kingdom [change]. All times are relative to the Europe/London timezone.

Azimuth: 86.6°
Max altitude: 41.9°
Azimuth: 273.3°

Asteroid 7 Iris Orbit Diagram

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Asteroid 7 Iris with respect of the Sun and the orbits of the major planets. The position of Asteroid 7 Iris and the planets along their orbits in this diagram accurately represents the current configuration of the objects in the Solar System. This is an experimental feature and it requires a WebGL enabled browser. Please provide us feedback!

Asteroid 7 Iris Ephemeris

The following table lists the ephemerides of Asteroid 7 Iris computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Asteroid 7 Iris in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2018 Sep 18 10h 36m 32s +04° 41’ 21” 10.58 Sextans
2018 Sep 19 10h 38m 12s +04° 30’ 39” 10.59 Sextans
2018 Sep 20 10h 39m 51s +04° 19’ 56” 10.60 Sextans
2018 Sep 21 10h 41m 30s +04° 09’ 14” 10.61 Sextans
2018 Sep 22 10h 43m 10s +03° 58’ 30” 10.62 Sextans
2018 Sep 23 10h 44m 49s +03° 47’ 45” 10.63 Sextans
2018 Sep 24 10h 46m 27s +03° 37’ 00” 10.64 Sextans
2018 Sep 25 10h 48m 06s +03° 26’ 16” 10.65 Sextans
2018 Sep 26 10h 49m 45s +03° 15’ 30” 10.66 Sextans
2018 Sep 27 10h 51m 21s +03° 04’ 45” 10.67 Sextans
2018 Sep 28 10h 52m 59s +02° 53’ 59” 10.68 Leo
2018 Sep 29 10h 54m 37s +02° 43’ 14” 10.69 Leo
2018 Sep 30 10h 56m 13s +02° 32’ 29” 10.70 Leo
2018 Oct 01 10h 57m 51s +02° 21’ 42” 10.70 Leo

Distance of Asteroid 7 Iris from Earth

The following chart shows the distance of Asteroid 7 Iris from Earth as a function of time. Distance data is measured in Astronomical Units and sampled with a 2 days interval.

The reported distances might be inaccurate around the times of closest approach for objects passing extremely close to Earth. The value of the distance of 7 Iris is also available as a real time updated value in the Live Position and Data Tracker.

Distance of Asteroid 7 Iris from Earth between January 2013 and December 2075

Light Curve of Asteroid 7 Iris

The following chart is the predicted light curve (visual magnitude as a function of time) of Asteroid 7 Iris, according to the most recent ephemerides data. Magnitude data is sampled with a 2 days interval and there might be inaccuracies for objects changing brightness very rapidly during the course of a few days. For comets there could be large discrepancies between the observed and predicted brightness because of their highly dynamic behaviour.

Predicted magnitude of Asteroid 7 Iris between January 2013 and December 2075

Asteroid 7 Iris Physical Data

The following shows the known values of the most important physical parameters of Asteroid 7 Iris. Source: JPL Small-Body Database

Physical Parameter Value Relative to Earth
Diameter 199.83 km 0.0157
Sideral Rotation 7.1390 hours 0.2983
Absolute Magnitude 5.51
Geometric Albedo 0.2766

Asteroid 7 Iris Orbital Elements

The following table lists the orbital elements of Asteroid 7 Iris at epoch 22 March 2018 00:00 UTC (JD: 2458200.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.23139770
Orbit inclination i 5.52348949°
Perihelion distance q 1.83359509 AU
274,301,922 km
Aphelion distance Q 2.93765028 AU
439,466,228 km
Semi-major axis a 2.38562269 AU
356,884,075 km
Orbital period period 3.6800 years
1,345.8636 days
Date of perihelion transit Tp 2017-Nov-18 07:20:28
2,458,075.8059 JD
Next perihelion transit 2021-Jul-26 04:04
2,459,421.6695 JD
Argument of perihelion peri 145.30147448543°
Longitude of the ascending node node 259.56236737775°
Mean anomaly M 33.353958879952°
Mean motion n 0.26748624°/day
Closest approach to Earth* 2017-Oct-31
Distance of closest approach* 0.84895471 AU
127,001,816 km

* NOTE: values for the closest approach are computed for the time interval between 2013-Jan-01 and 2075-Dec-31, with a sampling interval of 1 day.